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- EMDB-32018: cryo-EM structure of LTB4-bound BLT1 in complex with Gi protein -

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Basic information

Entry
Database: EMDB / ID: EMD-32018
Titlecryo-EM structure of LTB4-bound BLT1 in complex with Gi protein
Map data
Sample
  • Complex: BLT1/Gi complex
    • Protein or peptide: Leukotriene B4 receptor 1
    • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
    • Protein or peptide: scFv16
  • Ligand: LEUKOTRIENE B4
  • Ligand: CHOLESTEROL HEMISUCCINATE
  • Ligand: [(2R)-2-[(Z)-hexadec-9-enoyl]oxy-3-[oxidanyl-[(2S,3R,5R,6S)-2,3,4,5,6-pentakis(oxidanyl)cyclohexyl]oxy-phosphoryl]oxy-propyl] octadecanoate
  • Ligand: water
Function / homology
Function and homology information


leukotriene B4 receptor activity / leukotriene receptor activity / Leukotriene receptors / G protein-coupled peptide receptor activity / plasma membrane => GO:0005886 / Adenylate cyclase inhibitory pathway / positive regulation of protein localization to cell cortex / neuropeptide signaling pathway / regulation of cAMP-mediated signaling / D2 dopamine receptor binding ...leukotriene B4 receptor activity / leukotriene receptor activity / Leukotriene receptors / G protein-coupled peptide receptor activity / plasma membrane => GO:0005886 / Adenylate cyclase inhibitory pathway / positive regulation of protein localization to cell cortex / neuropeptide signaling pathway / regulation of cAMP-mediated signaling / D2 dopamine receptor binding / G protein-coupled serotonin receptor binding / regulation of mitotic spindle organization / cellular response to forskolin / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / Regulation of insulin secretion / muscle contraction / G protein-coupled receptor binding / G-protein beta/gamma-subunit complex binding / Olfactory Signaling Pathway / Activation of the phototransduction cascade / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / G-protein activation / G protein-coupled acetylcholine receptor signaling pathway / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / Prostacyclin signalling through prostacyclin receptor / Glucagon signaling in metabolic regulation / G beta:gamma signalling through CDC42 / ADP signalling through P2Y purinoceptor 12 / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / Sensory perception of sweet, bitter, and umami (glutamate) taste / response to peptide hormone / photoreceptor disc membrane / Adrenaline,noradrenaline inhibits insulin secretion / Glucagon-type ligand receptors / Vasopressin regulates renal water homeostasis via Aquaporins / G alpha (z) signalling events / cellular response to catecholamine stimulus / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / ADORA2B mediated anti-inflammatory cytokines production / sensory perception of taste / ADP signalling through P2Y purinoceptor 1 / adenylate cyclase-activating dopamine receptor signaling pathway / G beta:gamma signalling through PI3Kgamma / cellular response to prostaglandin E stimulus / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / GDP binding / G-protein beta-subunit binding / Inactivation, recovery and regulation of the phototransduction cascade / heterotrimeric G-protein complex / G alpha (12/13) signalling events / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / GTPase binding / retina development in camera-type eye / phospholipase C-activating G protein-coupled receptor signaling pathway / Ca2+ pathway / cell cortex / midbody / G alpha (i) signalling events / fibroblast proliferation / G alpha (s) signalling events / G alpha (q) signalling events / cell population proliferation / Ras protein signal transduction / Extra-nuclear estrogen signaling / inflammatory response / immune response / cell cycle / G protein-coupled receptor signaling pathway / lysosomal membrane / cell division / nucleotide binding / GTPase activity / centrosome / synapse / protein-containing complex binding / nucleolus / GTP binding / magnesium ion binding / signal transduction / extracellular exosome / nucleoplasm / membrane / plasma membrane / cytoplasm / cytosol
Similarity search - Function
Leukotriene B4 receptor / Leukotriene B4 type 1 receptor / G-protein alpha subunit, group I / G-alpha domain profile. / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit / G protein alpha subunit / G-protein, gamma subunit / G-protein gamma subunit domain profile. ...Leukotriene B4 receptor / Leukotriene B4 type 1 receptor / G-protein alpha subunit, group I / G-alpha domain profile. / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit / G protein alpha subunit / G-protein, gamma subunit / G-protein gamma subunit domain profile. / GGL domain / G-protein gamma-like domain superfamily / G-protein gamma-like domain / GGL domain / G protein gamma subunit-like motifs / Guanine nucleotide-binding protein, beta subunit / G-protein, beta subunit / G-protein coupled receptors family 1 signature. / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / 7 transmembrane receptor (rhodopsin family) / G-protein beta WD-40 repeat / WD40 repeat, conserved site / Trp-Asp (WD) repeats signature. / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / WD domain, G-beta repeat / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Guanine nucleotide-binding protein G(i) subunit alpha-1 / Leukotriene B4 receptor 1
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsHe Y / Wang N
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32070048 China
CitationJournal: Nat Commun / Year: 2022
Title: Structural basis of leukotriene B4 receptor 1 activation.
Authors: Na Wang / Xinheng He / Jing Zhao / Hualiang Jiang / Xi Cheng / Yu Xia / H Eric Xu / Yuanzheng He /
Abstract: Leukotriene B4 receptor 1 (BLT1) plays crucial roles in the acute inflammatory responses and is a valuable target for anti-inflammation treatment, however, the mechanism by which leukotriene B4 (LTB4) ...Leukotriene B4 receptor 1 (BLT1) plays crucial roles in the acute inflammatory responses and is a valuable target for anti-inflammation treatment, however, the mechanism by which leukotriene B4 (LTB4) activates receptor remains unclear. Here, we report the cryo-electron microscopy (cryo-EM) structure of the LTB4 -bound human BLT1 in complex with a G protein in an active conformation at resolution of 2.91 Å. In combination of molecule dynamics (MD) simulation, docking and site-directed mutagenesis, our structure reveals that a hydrogen-bond network of water molecules and key polar residues is the key molecular determinant for LTB4 binding. We also find that the displacement of residues M101 and I271 to the center of receptor, which unlock the ion lock of the lower part of pocket, is the key mechanism of receptor activation. In addition, we reveal a binding site of phosphatidylinositol (PI) and discover that the widely open ligand binding pocket may contribute the lack of specificity and efficacy for current BLT1-targeting drug design. Taken together, our structural analysis provides a scaffold for understanding BLT1 activation and a rational basis for designing anti-leukotriene drugs.
History
DepositionOct 1, 2021-
Header (metadata) releaseMar 9, 2022-
Map releaseMar 9, 2022-
UpdateMar 23, 2022-
Current statusMar 23, 2022Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.45
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.45
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7vkt
  • Surface level: 0.45
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_32018.png

Downloads & links

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Map

FileDownload / File: emd_32018.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1.1 Å
Density
Contour LevelBy AUTHOR: 0.45 / Movie #1: 0.45
Minimum - Maximum-4.1882477 - 5.9258623
Average (Standard dev.)-0.0023283297 (±0.10382499)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 281.6 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.11.11.1
M x/y/z256256256
origin x/y/z0.0000.0000.000
length x/y/z281.600281.600281.600
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS256256256
D min/max/mean-4.1885.926-0.002

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Supplemental data

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Sample components

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Entire : BLT1/Gi complex

EntireName: BLT1/Gi complex
Components
  • Complex: BLT1/Gi complex
    • Protein or peptide: Leukotriene B4 receptor 1
    • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
    • Protein or peptide: scFv16
  • Ligand: LEUKOTRIENE B4
  • Ligand: CHOLESTEROL HEMISUCCINATE
  • Ligand: [(2R)-2-[(Z)-hexadec-9-enoyl]oxy-3-[oxidanyl-[(2S,3R,5R,6S)-2,3,4,5,6-pentakis(oxidanyl)cyclohexyl]oxy-phosphoryl]oxy-propyl] octadecanoate
  • Ligand: water

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Supramolecule #1: BLT1/Gi complex

SupramoleculeName: BLT1/Gi complex / type: complex / Chimera: Yes / ID: 1 / Parent: 0 / Macromolecule list: #1-#5
Source (natural)Organism: Homo sapiens (human)
Recombinant expressionOrganism: Insect BA phytoplasma (bacteria)

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Macromolecule #1: Leukotriene B4 receptor 1

MacromoleculeName: Leukotriene B4 receptor 1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 37.740496 KDa
Recombinant expressionOrganism: Insect BA phytoplasma (bacteria)
SequenceString: MNTTSSAAPP SLGVEFISLL AIILLSVALA VGLPGNSFVV WSILKRMQKR SVTALMVLNL ALADLAVLLT APFFLHFLAQ GTWSFGLAG CRLCHYVCGV SMYASVWLIT AMSLDRSLAV ARPFVSQKLR TKAMARRVLA GIWVLSFLLA TPVLAYRTVV P WKTNMSLC ...String:
MNTTSSAAPP SLGVEFISLL AIILLSVALA VGLPGNSFVV WSILKRMQKR SVTALMVLNL ALADLAVLLT APFFLHFLAQ GTWSFGLAG CRLCHYVCGV SMYASVWLIT AMSLDRSLAV ARPFVSQKLR TKAMARRVLA GIWVLSFLLA TPVLAYRTVV P WKTNMSLC FPRYPSEGHR AFHLIFEAVT GFLLPFLIVV ASYSDIGRRL QARRFRRSRR TGRLVVLIIL TFAAFWLPYH VV NLAEAGR ALAGQAAGLG LVGKRLSLAR NVLIALAFLS SSVNPVLYAF AGGGLLRSAG VGFVAKLLEG TGAEASSTRR GGS LGQTAR SGPAALEPGP SESLTASSPL KLNELN

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Macromolecule #2: Guanine nucleotide-binding protein G(i) subunit alpha-1

MacromoleculeName: Guanine nucleotide-binding protein G(i) subunit alpha-1
type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 40.414047 KDa
Recombinant expressionOrganism: Insect BA phytoplasma (bacteria)
SequenceString: MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKNTIV KQMKIIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI ...String:
MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKNTIV KQMKIIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI PTQQDVLRTR VKTTGIVETH FTFKDLHFKM FDVGAQRSER KKWIHCFEGV TAIIFCVALS DYDLVLAEDE EM NRMHASM KLFDSICNNK WFTDTSIILF LNKKDLFEEK IKKSPLTICY PEYAGSNTYE EAAAYIQCQF EDLNKRKDTK EIY THFTCS TDTKNVQFVF DAVTDVIIKN NLKDCGLF

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Macromolecule #3: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 37.915496 KDa
Recombinant expressionOrganism: Insect BA phytoplasma (bacteria)
SequenceString: MGSLLQSELD QLRQEAEQLK NQIRDARKAC ADATLSQITN NIDPVGRIQM RTRRTLRGHL AKIYAMHWGT DSRLLVSASQ DGKLIIWDS YTTNKVHAIP LRSSWVMTCA YAPSGNYVAC GGLDNICSIY NLKTREGNVR VSRELAGHTG YLSCCRFLDD N QIVTSSGD ...String:
MGSLLQSELD QLRQEAEQLK NQIRDARKAC ADATLSQITN NIDPVGRIQM RTRRTLRGHL AKIYAMHWGT DSRLLVSASQ DGKLIIWDS YTTNKVHAIP LRSSWVMTCA YAPSGNYVAC GGLDNICSIY NLKTREGNVR VSRELAGHTG YLSCCRFLDD N QIVTSSGD TTCALWDIET GQQTTTFTGH TGDVMSLSLA PDTRLFVSGA CDASAKLWDV REGMCRQTFT GHESDINAIC FF PNGNAFA TGSDDATCRL FDLRADQELM TYSHDNIICG ITSVSFSKSG RLLLAGYDDF NCNVWDALKA DRAGVLAGHD NRV SCLGVT DDGMAVATGS WDSFLKIWN

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Macromolecule #4: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 7.861143 KDa
Recombinant expressionOrganism: Insect BA phytoplasma (bacteria)
SequenceString:
MASNNTASIA QARKLVEQLK MEANIDRIKV SKAAADLMAY CEAHAKEDPL LTPVPASENP FREKKFFCAI L

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Macromolecule #5: scFv16

MacromoleculeName: scFv16 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 26.277299 KDa
Recombinant expressionOrganism: Insect BA phytoplasma (bacteria)
SequenceString: VQLVESGGGL VQPGGSRKLS CSASGFAFSS FGMHWVRQAP EKGLEWVAYI SSGSGTIYYA DTVKGRFTIS RDDPKNTLFL QMTSLRSED TAMYYCVRSI YYYGSSPFDF WGQGTTLTVS AGGGGSGGGG SGGGGSADIV MTQATSSVPV TPGESVSISC R SSKSLLHS ...String:
VQLVESGGGL VQPGGSRKLS CSASGFAFSS FGMHWVRQAP EKGLEWVAYI SSGSGTIYYA DTVKGRFTIS RDDPKNTLFL QMTSLRSED TAMYYCVRSI YYYGSSPFDF WGQGTTLTVS AGGGGSGGGG SGGGGSADIV MTQATSSVPV TPGESVSISC R SSKSLLHS NGNTYLYWFL QRPGQSPQLL IYRMSNLASG VPDRFSGSGS GTAFTLTISR LEAEDVGVYY CMQHLEYPLT FG AGTKLEL

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Macromolecule #6: LEUKOTRIENE B4

MacromoleculeName: LEUKOTRIENE B4 / type: ligand / ID: 6 / Number of copies: 1 / Formula: LTB
Molecular weightTheoretical: 336.466 Da
Chemical component information

ChemComp-LTB:
LEUKOTRIENE B4

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Macromolecule #7: CHOLESTEROL HEMISUCCINATE

MacromoleculeName: CHOLESTEROL HEMISUCCINATE / type: ligand / ID: 7 / Number of copies: 4 / Formula: Y01
Molecular weightTheoretical: 486.726 Da
Chemical component information

ChemComp-Y01:
CHOLESTEROL HEMISUCCINATE

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Macromolecule #8: [(2R)-2-[(Z)-hexadec-9-enoyl]oxy-3-[oxidanyl-[(2S,3R,5R,6S)-2,3,4...

MacromoleculeName: [(2R)-2-[(Z)-hexadec-9-enoyl]oxy-3-[oxidanyl-[(2S,3R,5R,6S)-2,3,4,5,6-pentakis(oxidanyl)cyclohexyl]oxy-phosphoryl]oxy-propyl] octadecanoate
type: ligand / ID: 8 / Number of copies: 1 / Formula: 8IO
Molecular weightTheoretical: 837.069 Da
Chemical component information

ChemComp-8IO:
[(2R)-2-[(Z)-hexadec-9-enoyl]oxy-3-[oxidanyl-[(2S,3R,5R,6S)-2,3,4,5,6-pentakis(oxidanyl)cyclohexyl]oxy-phosphoryl]oxy-propyl] octadecanoate

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Macromolecule #9: water

MacromoleculeName: water / type: ligand / ID: 9 / Number of copies: 7 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation state3D array

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Sample preparation

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: OTHER / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.3000000000000003 µm / Nominal defocus min: 1.2 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

6vms

Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 450000
Initial angle assignmentType: RANDOM ASSIGNMENT
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

6vms


Chain - Chain ID: A
RefinementSpace: REAL / Protocol: OTHER
Output model

PDB-7vkt:
cryo-EM structure of LTB4-bound BLT1 in complex with Gi protein

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